Orlando shooter underwent company screening in 2013 with "no findings" - employer

An undated photo from a social media account of Omar Mateen, who Orlando Police have identified as the suspect in the mass shooting at a gay nighclub in Orlando, Florida, U.S., June 12, 2016. Omar Mateen via Myspace/Handout via REUTERS

WASHINGTON (Reuters) - The gunman who killed 50 people at a packed gay nightclub in Florida on Sunday had undergone company screening as recently as 2013 with "no findings," his employer, global security firm G4S , said on Sunday.

Omar Mateen, 29, a Florida resident and U.S. citizen who was the son of immigrants from Afghanistan, had worked for G4S since 2007, and was employed at a gated retirement community in South Florida, the company said in a statement late on Sunday.